Mill.



PATENTED MAY 26, 1908.

G. A. BROWNE.

MILL. APPLIOATION FILED APR.11,1907.

2 SHEETS-SHEET 1.

dram/7n? B/h Wf/VfSS/SS THE "cams PETERS co.. WASHINGTON, n. c,

' No. 888,465. I PATENTED MAY 26, 1908.

G. A. BROWNE.

MILL.

APPLICATION FILED APR. 11, 1907.

2 SHEETSSHEET Z yfsizs UNITED STATES PATENT OFFICE.-

GEORGE ALBERT BROWNE, OF TACOMA, WASHINGTON.

MILL.

Specification of Letters Patent.

' Patented May 26, 1908.

Application filed April 11, 1907. Serial No. 367,469.

.to provide a mill of inexpensive construction having a large capacity, and one that is ca able of convenient transportation, and rea ily taken apart or overhauled for repairs.

The lnvention' consists generally in various constructions and combinations, all as hereinafter described and particularly pointed out in the claims.

In the accompanying drawings, forming part of this specification, Figure 1 is a side elevation partially in section of a pulverizing mill embodying my invention. Fig. 2 is a vertical sectional View on the line a;a; of Fig. 1. Fig. 3 is a detail view of the bearing of one of the rolls, showing the means for relieving the pressure of the springs and roll on the ring when it is desired to remove the rings from the machine.

In the drawing, 2 represents a suitable base, 3 a plank housing or casing thereon, and 4 an uprightwall of timber, preferably, centrally located'within the housing. '5 is a driving shaft having abearing 6 at one end in a frame 7 and a stationary bearing 8 in the wall 4. A driving pulley 9 is mounted on said shaft, and rolls 10' are keyed on said shaft on each side of the wall 4. These rolls have convex peripheries and engage the concave surfaces 11 of rings 12 that are provided on each side of the wall 4 and revolve through their frictional contact with the rolls 10. The rolls are driven at any desired speed according to the character of the material that is being pulverized. They are both rigid or non-yielding in their bearings and sustain the weight of the rings. The rings are made in separable sections, as shown in Fig. 1, for convenience of removal,

. and connected together by suitable clamping means as indicated at 13. Below the drive rolls are shafts 1414 located on each side of the vertical axes of the rings and having bearings in boxes 15 that are movable in guides 16 provided in the wall 4. Crushing rolls 17 and 18 are mounted on the opposite ends of the said shafts and have peripheries corresponding to those of the drive rolls and I which the rolls 17 and 18 can be forcedaway arranged to contact with the inner concave surfaces of the rings 12. The rolls 17 and 18 are held in yielding engagement with the rings by means of springs 19 which inclose 0 pins 20 mounted in one end of the uides 16 and having their opposite ends loose y fitting within sockets 21 in the boxes 15. Screws 22 are preferably provided, by means of from the rings against the tension of the l springs 19 whenever it is desired to relieve the pressure on the rings for the purpose of removing them from the mill. A hopper 23 is provided above the mill, havingspouts 24 on each side leading down to a point above the crushing rolls for the purpose of delivering the material between said rolls and the rings. An inclined floor 25 is provided beneath the rings on each side of the wall and a 5 screw conveyer 26 receives the crushed material from these floors and carries it out of the mill. The rings and the rolls are chilled and the material, either quartz, limestone, or any other hard substance passing between the rings and the rolls will be reduced to a powder.

The mill is very sim )le in construction, its parts are easily accessi le and it can be conveniently transported. It is largely constructed of lumber and hence will be found particularly adapted for use in mines a long distance from a railroad or where it would be very difficult to move a machine composed almost entirely of metal.

By providing pairs of rings and rolls, I am not only able to greatly increase the capacity of the mill but the rolls on one side balance those on the other side and the strain is thereby equally distributed.

I claim as my invention:

1. The combination, with a driving shaft having a pulley, of a vertical wall wherein said shaft is journaled, driving rolls having convex peripheries secured on said shaft on each side of said wall, rings having concave inner surfaces located on each side of said wall and engaging said driving rolls to be revolved thereby, crushing rolls provided upon each side of said wall and having convex peripheries adapted to engage said rings, means for holding said crushing rolls in yielding contact with said rings, and means for delivering the material to be crushed between said rings and said rolls.

2. In a pulverizing mill, the combination with a vertical centrally arranged wall, of a driving shaft having fixed bearings in said 1 the bearings of said shafts and move them wall, rings arranged on each side of said and having concave inner faces and means for driving said rings from said shaft, said 1 rings and means for wall i inwardly against the tension of said springs and separate said crushing rolls from said delivering the material wall having radial openings near its base and to be crushed between said rings and crushshafts having movable bearings in said openings and springs arranged in said openings and adapted to hold said bearings outwardly with a yielding pressure, crushing rolls secured on said shafts on each side of said wall having convex peripheries to engage the conl vex surfaces of said rings, adjusting screws mounted in said wall and adapted to engage ing rolls, and a suitable casing inclosing said rings and rolls.

In witness whereof, I have hereunto set my hand this 20th day of March, 1907.

GEORGE ALBERT BRO'WNE. WVitnesses:

F. P. HAsKELL, Jr., J. W. BROWNE. 

